That's certainly true. However, I think it's interesting to ride hard, see what's sore the next day, and maybe train those sore muscles on not-hard days. Then on hard days maybe I'll have more endurance. I don't see a rationale for not doing that other than lack of time and specificity is quicker. I've always been able to find both pain and weakness on long hard rides. If I don't, I'm not doing it right. I try to keep the memory of riding through that pain alive when I'm training.

For instance, I noticed that today my lats are sore after a tough roller workout yesterday. My lats?? They wouldn't be if gyms weren't closed and I was still doing lat work. Never had sore lats before just from riding my bike. I do have dumbbells and a bench. Maybe I'll add a couple sets of one-arm raises or pullovers. The best chest work I've found is breathing deep and hard for a long time, i.e. ride! My morning pushups are good for my triceps and having more comfortable arms. On group rides, I always see folks shaking out their arms. Huh. Must not train them, eh? Yeah, so train what hurts.

Those seated leg raises shown above did make my hip flexors stronger so that I was more comfortable on long endurance spins. I don't seem to need them anymore though - I guess I've corrected that imbalance.